New Job

March 24, 1986

HAVANA, CUBA — ''Deficiencies and repeated errors in his work.'' Those were the reasons given when Antonio Perez Herrero was fired from the Communist Party's nine-man secretariat in 1985. He also was removed as an alternate member of the Politburo. Perez Herrero now has been appointed ambassador to Ethiopia. Cuban soldiers have been stationed in Ethiopia since 1977, when the Marxist government asked Havana for support in its war with Somalia over the Ogaden desert. Diplomatic sources say the number is now substantially lower than the 10,500 of 1984.